Unfortunately, this book doesn't discover America, it's basically a very long advertisement for keto diet and intermittent fasting you can learn about from tons of free articles and youtube. With a bit of wink towards paleo diet - he didn't exactly recommend it, but claimed hunter-gatherer societies had a better diet and quality of life than agricultural societies.
Oh yes, I'd love to have my diet consist only of healthy biological natural foods like fresh vegetables, fruits, non-processed meat and dairy. Who has money for that?
If we look at obesity statistics, one of the biggest obesity rates is among Latinx Americans who also happen to be the poorest on average segment of the society. Coincidence? I think not.
Yes, the average lifespan is going down, but also the average quality of life, accessibility of healthcare and the level of financial and social security is going down too. Who'd have thought these are related, huh?
This book is a very elaborate way to say "sugar, carbs and junk food are bad, mmkay?" I think everyone knows this already, but we don't have money for healthy food, we don't have time for proper meal prep so we resort to buying ready made junk, and we're likely addicted to the instant gratification the junk food provides (other addiction rates are also going up, just look at opioid addiction for example - addictions are a symptom of unbearability of life, not a cause; volumes were written on causes of addiction, but it's a bit besides the point here).
Yes, we could all do better if we went and touched grass, did yoga and meditation, exercised, took more time off, cooked more natural and healthy meals, slept enough hours and didn't worry and stress. Life will not let us.
Time and time again I pick some advice or self-help book expecting a recipe how to navigate the awfulness of life and time and time again it just tells me captain obvious stuff that's likely preaching to the choir (privileged, financially well off people who can afford all the "self-care" they need).
Thing is, nothing will change, because the problem is systemic - it's the food industry producing cheap, addictive junk food; it's the pharma industry that wants us dependent on lifelong medicine for chronic illnesses; it's the capitalism itself where big corps and conglomerates can block any change that affect their profits negatively, and governments are in their pockets. So vast swathes of population are doomed to be poor, sick, stressed and addicted.
Everyone already knows what's a "healthy lifestyle", people don't follow it because they don't have money, time, energy or circumstances to do so. It's nice someone wrote an elaborate tome explaining why unhealthy lifestyle is unhealthy, but who does this book help exactly? Who benefits from reading it? People who already follow a healthy lifestyle don't need it and people who don't most likely already are feeling guilty for it and don't need another reminder.